Patent US2491797A successfully refreshed from Google Patents.
US2491797A
Expired / Lapsed
US
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Side grading attachment for tractors and the like
Assignee: Individual
•
Filing: 1946-01-10
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Granted: 1949-12-20
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Expires: 1966-01-10
Abstract
No abstract record available.
Inventors
- 👤 Murray E Burns
- 👤 George M Bonnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:34
CPC Classifications
E; E01; E01B; E01B27/00; E01B27/02; E01B27/023; E01B27/025; E02; E02F; E02F3/00; E02F3/04; E02F3/76; E02F3/7663; E02F3/7686
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1322688A
Cited
US1191756A
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US1533198A
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US1718550A
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US1818750A
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US2266633A
Cited
US2312255A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-19 | 1953-06-20 | 1953-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-19 | 1957-06-20 | 1957-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-19 | 1961-06-20 | 1961-12-20 | $7700.00 | Window Closed / Lapsed |